| Citation: | TAN Deqiang, GU Yi, JIANG Hao, et al. Comparison and optimization of sealing performance between O-ring and X-ring rubber seals for SR20 aircraft landing gear shock absorber[J]. Journal of Aerospace Power, 2026, 41（2）：20250274 doi: 10.13224/j.cnki.jasp.20250274
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To address the issue of seal life degradation in SR20 aircraft landing gear shock absorbers caused by the replacement of original X-rings with domestic O-rings, a comparative study on the sealing performance differences between O-ring and X-ring rubber seals was conducted through finite element analysis. By establishing a Mooney-Rivlin hyperelastic material model, the sealing behavior under 5 MPa pressure and dynamic reciprocating motion conditions was simulated, with a focus on comparative analysis of key indicators including stress state, contact area, and leakage volume for both seal types. Additionally, based on parametric optimization design, the sealing performance of O-rings and X-rings with different cross-sectional dimensions was compared, ultimately determining the optimal cross-sectional size parameters for sealing performance. The results indicated that the single-seal structure of the O-ring exhibited poorer sealing stability under dynamic conditions compared with the multi-lip structure of the X-shaped rubber sealing ring.
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